<!DOCTYPE html>

<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>

        <style type="text/css">
            .wrapper { width: 500px ; height: 300px ; margin: 15px auto ; border: 20px solid blue ; }

            .first { border-top-left-radius: 50px 100px ; }

            .second { border-top-right-radius: 50px 100px ; }

            .third { border-bottom-left-radius: 50px 100px ; }

            .fourth { border-bottom-right-radius: 50px 100px ; }

            .fifth {
                border-top-left-radius: 50px 100px ;
                border-top-right-radius: 50px 100px ;
                border-bottom-left-radius: 50px 100px ;
                border-bottom-right-radius: 50px 100px ;
            }

            .sixth {
                border-radius: 50% ;
            }

        </style>
    </head>
    <body>

        <div class="wrapper first"></div>
        <div class="wrapper second"></div>
        <div class="wrapper third"></div>
        <div class="wrapper fourth"></div>
        <div class="wrapper fifth"></div>
        <div class="wrapper sixth"></div>
        
    </body>
</html>